<template>
    <!--  原生摄像头-->
    <div>


        <el-card class="box-card" style="display: inline-block; margin-top: 10px; margin-left: 10px">
            <div slot="header" class="clearfix">
                <span>实时雨量图</span>
            </div>
            <div id="main" style="width: 700px; height: 400px"></div>
        </el-card>

        <el-card class="box-card" style="display: inline-block; margin-top: 50px; margin-left: 1%">
            <div slot="header" class="clearfix">
                <span>实时路径规划</span>
            </div>

            <video id="videoCamera" class="canvas" :width="videoWidth" :height="videoHeight" autoPlay></video>
            <!--      <canvas id="canvasCamera" class="canvas" :width="videoWidth" :height="videoHeight"></canvas>-->

            <!--    <div>-->
            <!--      <el-button @click="photographBtn" icon="el-icon-camera" size="small">拍照</el-button>-->
            <!--      <el-button v-if="os" @click="openCamera" icon="el-icon-video-camera" size="small">打开摄像头</el-button>-->
            <!--      <el-button v-else @click="stopCamera" icon="el-icon-switch-button" size="small">关闭摄像头</el-button>-->
            <!--      <el-button @click="resetBtn" icon="el-icon-refresh" size="small">重置</el-button>-->
            <!--      <el-button @click="submitBtn" icon="el-icon-circle-close" size="small">提交</el-button>-->
            <!--    </div>-->
        </el-card>
    </div>
</template>

<script>

import * as echarts from 'echarts';

export default {

    mounted() {

        var Color = 'green';
        var chartDom = document.getElementById('main');
        var myChart = echarts.init(chartDom, 'dark');
        var option;

        function randomData() {
            now = new Date(+now + oneDay);
            value = value + Math.random() * 21 - 10;
            return {
                name: now.toString(),
                value: [
                    [now.getFullYear(), now.getMonth() + 1, now.getDate()].join('/'),
                    Math.round(value)
                ]
            };
        }
        let data = [];
        let now = new Date(1997, 9, 3);
        let oneDay = 24 * 3600 * 1000;
        let value = Math.random() * 1000;
        for (var i = 0; i < 1000; i++) {
            data.push(randomData());
        }
        option = {


            animation: false,
            // grid: {
            //   top: 0,
            //   bottom: '10%',
            //   left: '12%',
            //   right: '6%'
            // },

            xAxis: {
                type: "category",
                boundaryGap: false,
                axisTick: {
                    show: false,
                },
                axisLabel: {
                    show: false,
                    formatter(val) {
                        return val.substr(11, 5);
                    },
                },
                data: this.hrtime
            },
            yAxis: [{
                type: 'value',
                max: 140,
                axisLine: {
                    show: true,
                },
                splitNumber: 4,
                splitLine: {
                    show: false
                },
                axisLabel: {
                    show: false
                }
            },
            {
                type: 'value',
                max: 140,
                axisLine: {
                    show: true,
                },
                splitNumber: 4,
                splitLine: {
                    show: false
                },
                axisLabel: {
                    show: false
                }
            }
            ],
            visualMap: {
                show: false,
                dimension: 1,
                pieces: [{
                    gte: 5,
                    lte: 950,
                    color: "#0BD2C8",
                },
                {
                    gt: 95,
                    color: "#f97f7f",
                },
                    // {
                    //   lt: 50,
                    //   color: "#f97f7f",
                    // },
                ],
            },
            series: [{
                type: "line",
                symbol: "none",
                markLine: {
                    symbol: 'none',
                    emphasis: {
                        disabled: true
                    },
                    data: [{
                        silent: false,
                        lineStyle: {
                            type: 'dashed',
                            color: '#7d888b',
                            opacity: 0.5
                        },
                        label: {
                            show: false
                        },
                        yAxis: 140
                    },
                    {
                        silent: false,
                        lineStyle: {
                            type: 'dashed',
                            color: '#7d888b',
                            opacity: 0.5
                        },
                        label: {
                            show: false
                        },
                        yAxis: 95.1
                    },
                    {
                        silent: false,
                        lineStyle: {
                            type: 'dashed',
                            color: '#7d888b',
                            opacity: 0.5
                        },
                        label: {
                            show: false
                        },
                        yAxis: 50
                    }
                    ]
                },
                data: this.hrdata,
                markArea: {
                    itemStyle: {
                        color: "#003b41",
                    },
                    data: [
                        [{
                            yAxis: 50,
                        },
                        {
                            yAxis: 95,
                        },
                        ],
                    ],
                },
            },],


            tooltip: {
                trigger: 'axis',
                formatter: function (params) {
                    params = params[0];
                    var date = new Date(params.name);
                    return (
                        date.getDate() +
                        '/' +
                        (date.getMonth() + 1) +
                        '/' +
                        date.getFullYear() +
                        ' : ' +
                        params.value[1]
                    );
                },
                axisPointer: {
                    animation: false
                }
            },
            xAxis: {
                type: 'time',
                splitLine: {
                    show: false
                }
            },
            yAxis: {
                type: 'value',
                boundaryGap: [0, '100%'],
                splitLine: {
                    show: true
                }
            },
            series: [
                {
                    name: 'Fake Data',
                    type: 'line',
                    showSymbol: false,
                    data: data,
                    color: Color
                }
            ]
        };
        setInterval(function () {

            for (var i = 0; i < 5; i++) {
                data.shift();
                data.push(randomData());
                // var tempData =lastData.value[1]
                // console.log(tempData)
                // console.log(Color)
                // if (tempData >1000)
                // {Color = 'red';}
                // else {Color = 'green';}



            }
            myChart.setOption({
                series: [
                    {
                        // color:Color,
                        data: data
                    }
                ]
            });
        }, 1000);

        option && myChart.setOption(option);


    },



    name: "camera",
    data() {
        return {
            os: false,//控制摄像头开关
            thisVideo: null,
            thisContext: null,
            // thisCancas: null,
            imgSrc: '',
            videoWidth: 600,
            videoHeight: 400,
        };
    },
    created() {
        this.openCamera();
    },
    methods: {
        submitBtn() {
            console.log(this.imgSrc);
        },
        // 调用摄像头权限
        openCamera() {
            //必须在model中render后才可获取到dom节点,直接获取无法获取到model中的dom节点
            this.$nextTick(() => {
                const _this = this;
                this.os = false;//切换成关闭摄像头
                // this.thisCancas = document.getElementById('canvasCamera');
                // this.thisContext = this.thisCancas.getContext('2d');
                this.thisVideo = document.getElementById('videoCamera');
                // 旧版本浏览器可能根本不支持mediaDevices，我们首先设置一个空对象
                if (navigator.mediaDevices === undefined) {
                    navigator.mediaDevices = {}
                }
                // 一些浏览器实现了部分mediaDevices，我们不能只分配一个对象
                // 使用getUserMedia，因为它会覆盖现有的属性。
                // 这里，如果缺少getUserMedia属性，就添加它。
                if (navigator.mediaDevices.getUserMedia === undefined) {
                    navigator.mediaDevices.getUserMedia = function (constraints) {
                        // 首先获取现存的getUserMedia(如果存在)
                        let getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.getUserMedia;
                        // 有些浏览器不支持，会返回错误信息
                        // 保持接口一致
                        if (!getUserMedia) {
                            return Promise.reject(new Error('getUserMedia is not implemented in this browser'))
                        }
                        // 否则，使用Promise将调用包装到旧的navigator.getUserMedia
                        return new Promise(function (resolve, reject) {
                            getUserMedia.call(navigator, constraints, resolve, reject)
                        })
                    }
                }
                const constraints = {
                    audio: false,
                    video: { width: _this.videoWidth, height: _this.videoHeight, transform: 'scaleX(-1)' }
                };
                navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
                    // 旧的浏览器可能没有srcObject
                    if ('srcObject' in _this.thisVideo) {
                        _this.thisVideo.srcObject = stream
                    } else {
                        // 避免在新的浏览器中使用它，因为它正在被弃用。
                        _this.thisVideo.src = window.URL.createObjectURL(stream)
                    }
                    _this.thisVideo.onloadedmetadata = function (e) {
                        _this.thisVideo.play()
                    }
                }).catch(err => {
                    this.$message({
                        message: '没有开启摄像头权限或浏览器版本不兼容',
                        type: 'warning'
                    });
                });
            });
        },
        //拍照按钮
        photographBtn() {
            // 点击，canvas画图
            this.thisContext.drawImage(this.thisVideo, 0, 0, this.videoWidth, this.videoHeight);
            // 获取图片base64链接
            // this.imgSrc = this.thisCancas.toDataURL('image/png');
        },
        //清空画布
        clearCanvas(id) {
            let c = document.getElementById(id);
            let cxt = c.getContext("2d");
            cxt.clearRect(0, 0, c.width, c.height);
        },
        //重置画布
        resetBtn() {
            this.imgSrc = "";
            this.clearCanvas('canvasCamera');
        },
        //关闭摄像头
        stopCamera() {
            if (this.thisVideo && this.thisVideo !== null) {
                this.thisVideo.srcObject.getTracks()[0].stop();
                this.os = true;//切换成打开摄像头
            }
        },
    }
};
</script>

